All Saint's Day - Holy Day of Obligation

All Saint's Day - Holy Day of Obligation Thursday, November 1 All Saints' Day, also known as All Hallows' Day, the Feast of All Saints, or Solemnity of All Saints, is a Christian festival celebrated in honor of all the saints, known and unknown. It is celebrated on 1 November by the Roman Catholic Church. All Saints' Day and All Souls' Day stems from a belief that there is a powerful spiritual bond between those in heaven (the "Church triumphant"), and the living (the "Church militant"). In Catholic theology, the day commemorates all those who have attained the beatific vision in Heaven. It is a national holiday in many historically Catholic countries. (Also the origin of All Hallows' Eve Day or 'Halloween'.)